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LSI/CSI LS7082N1-S
- Part No.:
- LS7082N1-S
- Manufacturer:
- LSI/CSI
- Category:
- Specialized ICs
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Description:
- IC CLOCK CONVERTER 14SOIC
- Quantity:
Unit Price:$4.26
Ext Price:$4.26
- Payment:
- Shipping:
Product Details
LS7082N1-S - Quadrature Clock Converter with Index
LSI/CSI LS7082N1-S converts A/B encoder quadrature and an index input into up-clock, down-clock, direction and synchronized index outputs. The -S ordering suffix identifies a 14-pin narrow-body SOIC surface-mount package.
The LS7082N1 manufacturer datasheet explicitly covers the LS7082N1-S SOIC variant and its 14-pin assignment.
Overview
LS7082N1-S is a CMOS interface for incremental optical or magnetic encoders. It validates the phase-related A and B inputs, emits separate low-going UPCK and DNCK pulses, indicates direction on UP/DN, and synchronizes encoder index information to quadrature activity. An external up/down counter can use these outputs for position and direction sensing.
Key Advantages
UPCK and DNCK simplify interfaces that accept distinct up- and down-count pulses.
A dedicated INDX input and synchronized index output support position-reference events.
Control inputs select x1, x2 or x4 quadrature decoding.
An external RBIAS resistor controls output-clock pulse width.
Feature Summary
3 V to 12 V in the manufacturer electrical-characteristics table.
On-chip A/B validation helps reject encoder dither.
UP/DN is high for up count and low for down count.
The manufacturer lists output clock frequency up to 16 MHz, subject to timing constraints.
Package & Footprint
The -S suffix denotes the standard SOIC variant of the 14-pin LS7082N1 family. LCDChip registers the package as 14-SOIC (0.154 inch, 3.90 mm width). Use the manufacturer's 14-pin SOIC outline for lead pitch, body width and pin-1 orientation; the DIP version is not footprint-compatible.
- Compare land pattern dimensions with the controlled SOIC drawing.
- Locate pin 1 and distinguish index input pin 2 from index output pin 14.
- Do not substitute the through-hole DIP footprint.
The registered 14-SOIC JPG is not present locally. The expected path is retained until a verified image is supplied.
Pin Functions
The following top-view assignments are taken from the LSI/CSI LS7082N1 datasheet, which names the -S SOIC variant.
Positive supply terminal.
Accepts encoder index-track pulses.
External resistor to VSS adjusts output pulse width.
Negative supply terminal.
Filtered quadrature inputs.
No connection per the manufacturer pin diagram.
Low selects x2 mode regardless of x4/x1.
With x2 high, low selects x1 and high selects x4.
High indicates up count; low indicates down count.
Low-going down-count and up-count pulses, respectively.
Synchronized low-going index-reference pulses.
Tie unused input pins to VDD or VSS as instructed by the manufacturer; NC pins are not inputs.
Key Specifications
| Manufacturer | LSI/CSI |
|---|---|
| Exact ordering code | LS7082N1-S |
| Function | A/B quadrature to separate UPCK and DNCK with direction and index |
| Package | 14-pin, 150 mil SOIC; registered 14-SOIC |
| Mounting | Surface mount |
| DC supply range | 3 V minimum to 12 V maximum |
| Operating temperature | -20 to +85 degrees C in the manufacturer ratings and electrical tables |
| Resolution | x1, x2 or x4 selected by x2 and x4/x1 inputs |
| Output clock capability | Up to 16 MHz on manufacturer product page |
| RBIAS resistor | 2 kilohms to 10 megohms in the electrical-characteristics table |
| Supply current | 1.5 mA typical, 1.65 mA maximum at 12 V, zero input frequency and RBIAS = 2 megohms |
| Output pulse width | 180 ns typical at VDD = 5 V under datasheet timing conditions |
| Input-to-output delay | 220 ns typical, 345 ns maximum at VDD = 5 V under datasheet timing conditions |
Output pulse width must be less than or equal to A/B pulse separation as stated by the manufacturer.
Replacement Considerations
The manufacturer lists LS7082N1 as a DIP package version, but no exact LCDChip catalog record was found for it and its footprint differs. LS7083N-S is an 8-SOIC converter with separate up/down clocks but lacks the LS7082N1-S 14-pin index interface. LS7084N-S instead provides combined CLK plus UP/DN and also uses an 8-SOIC footprint. Exact records for those two alternatives exist, but their pages are unpublished; no internal links are added. None is presented as a drop-in replacement.
Manufacturer Information
LSI/CSI lists LS7082N1-S as an in-production quadrature clock decoder. Its controlled datasheet provides the full pin table, mode-selection truth table, timing and electrical characteristics. Confirm current revision and order-code availability before procurement.
Applications
Convert optical or magnetic A/B signals to count clocks.
Use the index channel for a synchronized reference position.
Drive separate up and down count inputs.
Provide direction and position-reference information to control electronics.
Quality & Authenticity
Check the complete LS7082N1-S order code, 14-pin SOIC body, pin-1 mark and traceability on receipt. Confirm required environmental and lot documents with the supplier and validate device behavior against the current manufacturer datasheet.
FAQ
Does LS7082N1-S include an index channel?
Yes. Pin 2 accepts index pulses and pin 14 supplies synchronized index output pulses.
How is x2 mode selected?
Drive pin 8 low; the x4/x1 input then does not change the x2 selection.
Are UPCK and DNCK combined?
No. They are separate low-going outputs on pins 13 and 12.
Can an 8-SOIC alternative use the same footprint?
No. This is a 14-SOIC part with a different pin assignment.
Engineering Notice
This summary does not replace the controlled LSI/CSI datasheet. Verify mode logic, index timing, RBIAS, supply limits, counter interface and package dimensions before design release. The registered package JPG remains unverified online.
LS7082N1-S Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- LSI/CSI
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Clock Converter
- Applications:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
- Grade:
- -
- Qualification:
- -
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